Enhypnon

Turco, Federica, Ślipiński, Adam & Lambkin, Christine L., 2013, Enhypnon Carter: a taxonomic revision of an endemic Australian genus of ground-dwelling beetles (Coleoptera: Zopheridae), Zootaxa 3681 (4), pp. 371-394 : 373-374

Review of Enhypnon species

Enhypnon cordicollis Turco and Ś lipi ń ski sp. n. ( Figs 1 a, 2a, 4a, 5a, 6a, 7a)

Types. Holotype. Australia, Tasmania: Lower Gordon R. (42.48.5S 145.51E 42.48.5S 145.54E),. iii.1977, litter, 5R.2480, Howard & Hill (ANIC).

Paratypes. Tasmania: Same data as holotype (22, ANIC); Frodshams Pass, 42.49S 146.13E, 18.xi.1989, Tube 60 thamnic rainforest litter, P. Greenslade (4, ANIC); 2 km S Frodshams Pass, 42.50S 146.23E, 18.XI.1989, Tube 288 implicate rainforest litter, P. Greenslade (1, ANIC); SW of Frodshams Pass, 42.49S 146.13E,. iii.1985, Berlesate ANIC 1072 Nothofagus leaf litter, P. Greenslade (2, ANIC); 2 km S Frodshams Pass, 42.50S 146.23E, 24.i.1983, Berlesate 793 rainforest litter, I.D. Naumann & J.C. Cardale (7, ANIC); 12 mi S Derwent Bridge, 9.ii.1977, FMHD #77 – 124 litter u. shrub, J. Kethley [GE: 42.309S 146.237E] (1, FMNH); Cradle Mt. Nat. Pk. Cradle Mt. 4500', 4.ii.1977, FM(HD) #77 – 131 forest floor, J. Kethley [Ga: 41.683S 145.933E] (1, FMNH); Cradle Mt. Nat. Pk, Waldheim For (3000ft), 2.ii.1977, FMHD #77 – 107 litter of Nothofagus cunninghami, J. Kethley [Ga: 41.633S 145.933E] (1, FMNH); Cradle Mtn.Nat. Pk, Waldheim For (3500ft), 3.ii.1977, FMHD #77 – 109 litter of unburned Nothofagus gunnei, J. Kethley [Ga: 41.633S 145.933E] (5, FMNH); Hartz Mts. NP, Hartz Rd., 740 m, 8 – 10.II.1980, Eucalyptus - Nothofagus , A. Newton & M. Thayer, litter [Ga: 43.233S 146.767E] (1, ANIC); Lower Gordon R. (42.42S 145.53E 42.41.5S 145.53E),. ii.1977, moss, Howard & Hill (2, ANIC); same locality,. ii.1977, litter, Howard & Hill (2, ANIC); same locality,. i.1977, litter, Howard & Hill (8, ANIC); same locality,. i.1977, moss, Howard & Hill (1, ANIC); same locality,. ii.1977, litter, Howard & Hill (1, ANIC); same locality,. iii.1977, moss, Howard & Hill (1, ANIC); same locality,. iii.1977, litter, Howard & Hill (2, ANIC).

Other Specimens examined. Tasmania: J. W. Evans (1, AMSA); Lake St Clair N.P., Mt Rufus track North, 426’56’’S 1466’6’’E, 13.III.2008, M. Wanat, sifted litter, Nothofagus forest (4, QMBA ethanol coll.).

Diagnosis. Among the species with low tubercles on elytra, Enhypnon cordicollis is similar to E. kosciuszko in having the pronotum weakly explanate and elytral costae and tubercles very low. It can be distinguished from E. kosciuszko by the pronotum abruptly constricted posteriorly, eyes much larger and tarsomeres I – III narrower.

Description. Body length: 1.85 – 2.3 mm; body maximum width: 0.85 – 1.2 mm.

Body: small, compact, distinctly convex; colour uniformly dark brown, elytra weakly patterned in some specimens ( Fig. 2 a); vestiture consiting of sparse, fine, short, recumbent setae, setation longer around antennomeres III – XI.

Head: dorsal surface coarsely sub-rugose; maximum width at eyes (0.56 – 0.7 mm), abruptly constricted behind eyes; frons distinctly and widely concave between eyes; frontal ridge weakly raised and sinuate in frontal view, thicker in front of eyes above antennal insertion; clypeus anteriorly slightly curved, relatively narrow (ratio clypeus width/head max. width: 0.45 – 0.47), lateral angles acute; eyes large, protruding, coarsely faceted; antenna 11- segmented with a weakly-developed, loose 2-segmented club; antennomere I sub-oval, more than 1.5 times as long as wide; II – IV slightly longer than wide, progressively shorter; V – IX short, rounded; X cupuliform, about twice as wide as IX; XI larger, slightly pointed. Last maxillary palpomere flat, securiform (see Fig. 6 a).

Pronotum: weakly explanate, abruptly constricted posteriorly; surface coarsely sub-rugose, lacking tubercles; lateral margins defined, visible from above in anterior half, crenulate.

Leg: simple; tarsomeres not transverse.

Elytra: weakly costate, two pairs of low, sub-apical tubercles on interval 3, visible in lateral view ( Fig. 4 a); elytral punctures wide, regular, clearly visible.

Etymology. The name cordicollis derives from the Latin neuter nouns cor, cordis (= heart) and collum (= neck) in the ablative case and it refers to the shape of the pronotum.

Distribution. Tasmania ( Fig. 7 a).

Figures

FIGURE 1. Dorsal habitus, drawings by Sybil Curtis: a. Enhypnon cordicollis; b. E. costatum; c. E. laticeps. Scale bars = 1 mm.

FIGURE 2. Dorsal habitus: a. Enhypnon cordicollis; b. E. costatum; c. E. horridum; d. E. kosciuszko; e. E. laticeps; f. E. punctatum. Scale bars = 0.5 mm.

FIGURE 4. Lateral habitus: a. Enhypnon cordicollis; b. E. costatum; c. E. horridum; d. E. kosciuszko; e. E. laticeps; f. E. punctatum; g. E. simplex; h. E. squamosum; i. E. latitarsis; j. E. tuberculatum. Scale bars = 0.5 mm.

FIGURE 6. Maxillary palps: a. Enhypnon cordicollis; b. E. costatum; c. E. horridum; d. E. kosciuszko; e. E. laticeps; f. E. punctatum; g. E. simplex; h. E. squamosum; i. E. latitarsis; j. E. tuberculatum. Scale bars = 0.1 mm.

FIGURE 7. Distribution map of Enhypnon species endemic to Tasmania.